Clean up apparently-unnecessary mentions of BUCK2 in scripts (#13394)

We no longer require buck2 in the top-level ExecuTorch build as of
previous PRs in this stack.

Author: swolchok

.ci/scripts/utils.sh

@@ -131,8 +131,6 @@ build_executorch_runner_cmake() {
   else
       CXXFLAGS=""
   fi
-  # This command uses buck2 to gather source files and buck2 could crash flakily
-  # on MacOS
   CXXFLAGS="$CXXFLAGS" retry cmake -DPYTHON_EXECUTABLE="${PYTHON_EXECUTABLE}" -DCMAKE_BUILD_TYPE="${1:-Release}" ..
   popd || return
 

backends/cadence/build_cadence_fusionG3.sh

@@ -36,7 +36,7 @@ if $STEPWISE_BUILD; then
         -Bcmake-out .
 
     echo "Building any Cadence-specific binaries on top"
-    CXXFLAGS="-fno-exceptions -fno-rtti" cmake -DBUCK2="$BUCK" \
+    CXXFLAGS="-fno-exceptions -fno-rtti" cmake \
         -DCMAKE_TOOLCHAIN_FILE=/home/zonglinpeng/ws/zonglinpeng/executorch/backends/cadence/cadence.cmake \
         -DCMAKE_INSTALL_PREFIX=cmake-out \
         -DCMAKE_BUILD_TYPE=Release \
@@ -57,7 +57,7 @@ if $STEPWISE_BUILD; then
 else
     echo "Building Cadence toolchain with ExecuTorch packages"
     cmake_prefix_path="${PWD}/cmake-out/lib/cmake/ExecuTorch;${PWD}/cmake-out/third-party/gflags"
-    CXXFLAGS="-fno-exceptions -fno-rtti" cmake -DBUCK2="$BUCK" \
+    CXXFLAGS="-fno-exceptions -fno-rtti" cmake \
         -DCMAKE_PREFIX_PATH="${cmake_prefix_path}" \
         -DHAVE_SYS_STAT_H=ON \
         -DCMAKE_TOOLCHAIN_FILE=./backends/cadence/cadence.cmake \

backends/cadence/build_cadence_hifi4.sh

@@ -35,7 +35,7 @@ if $STEPWISE_BUILD; then
         -Bcmake-out .
 
     echo "Building any Cadence-specific binaries on top"
-    CXXFLAGS="-fno-exceptions -fno-rtti" cmake -DBUCK2="$BUCK" \
+    CXXFLAGS="-fno-exceptions -fno-rtti" cmake \
         -DCMAKE_TOOLCHAIN_FILE=./backends/cadence/cadence.cmake \
         -DCMAKE_INSTALL_PREFIX=cmake-out \
         -DCMAKE_BUILD_TYPE=Release \
@@ -56,7 +56,7 @@ if $STEPWISE_BUILD; then
 else
     echo "Building Cadence toolchain with ExecuTorch packages"
     cmake_prefix_path="${PWD}/cmake-out/lib/cmake/ExecuTorch;${PWD}/cmake-out/third-party/gflags"
-    CXXFLAGS="-fno-exceptions -fno-rtti" cmake -DBUCK2="$BUCK" \
+    CXXFLAGS="-fno-exceptions -fno-rtti" cmake \
         -DCMAKE_PREFIX_PATH="${cmake_prefix_path}" \
         -DCMAKE_TOOLCHAIN_FILE=./backends/cadence/cadence.cmake \
         -DCMAKE_INSTALL_PREFIX=cmake-out \

examples/apple/mps/scripts/build_mps_executor_runner.sh

@@ -38,7 +38,7 @@ done
 
 rm -rf "$OUTPUT"
 
-cmake -DBUCK2="$BUCK" \
+cmake \
           -DCMAKE_INSTALL_PREFIX=cmake-out \
           -DCMAKE_BUILD_TYPE="$MODE" \
           -DEXECUTORCH_BUILD_DEVTOOLS=ON \

examples/apple/mps/test_mps.sh

@@ -15,7 +15,7 @@ cmake_install_executorch_devtools_lib() {
   echo "Installing libexecutorch.a, libportable_kernels.a, libetdump.a, libbundled_program.a"
   rm -rf cmake-out
 
-  retry cmake -DBUCK2="$BUCK" \
+  retry cmake \
           -DCMAKE_INSTALL_PREFIX=cmake-out \
           -DCMAKE_BUILD_TYPE=Release \
           -DEXECUTORCH_BUILD_DEVTOOLS=ON \
@@ -56,11 +56,5 @@ then
   PYTHON_EXECUTABLE=python3
 fi
 
-if [[ -z $BUCK ]];
-then
-  BUCK=buck2
-fi
-
-
 cmake_install_executorch_devtools_lib
 test_cmake_mps

examples/demo-apps/android/LlamaDemo/docs/delegates/mediatek_README.md

@@ -54,7 +54,6 @@ zstd -cdq "<downloaded_buck2_file>.zst" > "<path_to_store_buck2>/buck2" && chmod
 
 ### Set Environment Variables
 ```
-export BUCK2=path_to_buck/buck2 # Download BUCK2 and create BUCK2 executable
 export ANDROID_NDK=path_to_android_ndk
 export NEURON_BUFFER_ALLOCATOR_LIB=path_to_buffer_allocator/libneuron_buffer_allocator.so
 export NEURON_USDK_ADAPTER_LIB=path_to_usdk_adapter/libneuronusdk_adapter.mtk.so

examples/demo-apps/apple_ios/LLaMA/docs/delegates/xnnpack_README.md

@@ -127,7 +127,7 @@ Go to Project Navigator, click on LLaMA. `Project --> LLaMA --> Package Dependen
 
 Note: You should only use this step if the prebuilt package doesn't work for your usecase (For example, you require the latest PRs from main, where there are no pre-built package yet)
 
-If you need to manually build the package, run the following command in your terminal
+If you need to manually build the package, run the following command in your terminal:
 ```
 # Install a compatible version of Buck2
 BUCK2_RELEASE_DATE="2024-12-16"

examples/qualcomm/test_qualcomm.sh

@@ -15,7 +15,7 @@ cmake_install_executorch_qnn_lib() {
   echo "Installing libexecutorch.a, libqnn_executorch_backend.a"
   rm -rf cmake-out
 
-  retry cmake -DBUCK2="$BUCK" \
+  retry cmake \
           -DCMAKE_INSTALL_PREFIX=cmake-out \
           -DCMAKE_BUILD_TYPE=Release \
           -DEXECUTORCH_BUILD_QNN=ON \
@@ -55,11 +55,5 @@ then
   PYTHON_EXECUTABLE=python3
 fi
 
-if [[ -z $BUCK ]];
-then
-  BUCK=buck2
-fi
-
-
 cmake_install_executorch_qnn_lib
 test_cmake_qualcomm

extension/llm/export/quantizer_lib.py

@@ -108,7 +108,7 @@ def check_embedding_byte_registered():
                     "Need to specify shared library path to register quantized ops (and their out variants) into EXIR.\n"
                     "Follow the following steps to build the needed lib via cmake.\n"
                     "Then from root executorch dir do the following:\n"
-                    "rm -rf cmake-out && mkdir cmake-out && (cd cmake-out && cmake -DBUCK2=<path-to-buck2> -DEXECUTORCH_BUILD_KERNELS_QUANTIZED_AOT=ON ..) && cmake --build . -j16\n"
+                    "rm -rf cmake-out && mkdir cmake-out && (cd cmake-out && cmake -DEXECUTORCH_BUILD_KERNELS_QUANTIZED_AOT=ON ..) && cmake --build . -j16\n"
                     'To find the location of the lib: find cmake-out -name "libquantized_ops_aot_lib*"\n'
                     "Then specify the said library via -s <path to libquantized_ops_aot_lib.so\n"
                 )

test/build_optimized_size_test.sh

@@ -21,7 +21,7 @@ cmake_install_executorch_lib() {
   echo "Installing libexecutorch.a"
   clean_executorch_install_folders
   update_tokenizers_git_submodule
-  CXXFLAGS="-g" retry cmake -DBUCK2="$BUCK2" \
+  CXXFLAGS="-g" retry cmake \
           -DCMAKE_CXX_STANDARD_REQUIRED=ON \
           -DCMAKE_INSTALL_PREFIX=cmake-out \
           -DCMAKE_BUILD_TYPE=MinSizeRel \